#include <bits/stdc++.h>
using namespace std;

string file = "damesah";
ifstream fin(file + ".in");
ofstream fout(file + ".out");

int n;

int main() {

    fin >> n;

    int nr1 = (n >> 1) + (n & 1);
    int nr2 = n;

    for (int i = 1; i <= n; i++)
        if (i & 1)
            fout << nr1-- << ' ';
        else
            fout << nr2-- << ' ';

    fout << '\n' << 2;

    return 0;
}